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Fibril. Hierarchical structure of hair in the cortex and cuticle, highlighting the scale which defines fibrils. Fibrils (from the Latin fibra [1]) are structural biological materials found in nearly all living organisms. Not to be confused with fibers or filaments, fibrils tend to have diameters ranging from 10–100 nanometers (whereas fibers ...
Atrial fibrillation is an irregular and uncoordinated contraction of the cardiac muscle of atria. It can be a chronic condition, usually treated with anticoagulation and sometimes with conversion to normal sinus rhythm. In this condition the normal electrical pulses coming from the sinoatrial node are overwhelmed by disorganized electrical ...
315,000 with atrial flutter (2019) [10] Atrial fibrillation ( AF, AFib or A-fib) is an abnormal heart rhythm (arrhythmia) characterized by rapid and irregular beating of the atrial chambers of the heart. [11] [12] It often begins as short periods of abnormal beating, which become longer or continuous over time. [4]
Spicules near the solar limb. They appear as dark "hairs" above the solar surface. In solar physics, a spicule, also known as a fibril or mottle, [a] is a dynamic jet of plasma in the Sun 's chromosphere about 300 km in diameter. [1] They move upwards with speeds between 15 and 110 km/s from the photosphere and last a few minutes each [1 ...
The Research Institute of Organic Agriculture (German: Forschungsinstitut für biologischen Landbau, in short: FiBL ), is an organic farming information and research centre. As an independent and non-profit organization, it promotes research and projects that help farmers improve their productivity with consideration of environmental and health ...
Fibrin (also called Factor Ia) is a fibrous, non-globular protein involved in the clotting of blood. It is formed by the action of the protease thrombin on fibrinogen, which causes it to polymerize. The polymerized fibrin, together with platelets, forms a hemostatic plug or clot over a wound site.
Anatomical terms of microanatomy. [ edit on Wikidata] A myofibril (also known as a muscle fibril or sarcostyle) [1] is a basic rod-like organelle of a muscle cell. [2] Skeletal muscles are composed of long, tubular cells known as muscle fibers, and these cells contain many chains of myofibrils. [3] Each myofibril has a diameter of 1–2 ...
Amyloids are formed of long unbranched fibers that are characterized by an extended β-sheet secondary structure in which individual β strands (β-strands) (coloured arrows in the adjacent figure) are arranged in an orientation perpendicular to the long axis of the fiber. Such a structure is known as cross-β structure.